CVE-2022-48935

Kernel compromise via stale nftables flowtable hooks

Published Aug 22, 2024 · Updated Aug 5, 2026

Use-after-free in netfilter in affected Linux kernel versions allows local users to compromise or crash the kernel via flowtable teardown. During network-namespace exit, nf_tables_flowtable_destroy() releases a flowtable before its registered hooks are removed, leaving netfilter hook entries with freed nft_hook and nf_flowtable references. A low-privileged local process can reach the sequence through nftables netlink messages when user and network namespaces permit CAP_NET_ADMIN, with no user interaction.

CVSS severity5.5
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in netfilter in affected Linux kernel versions allows local users to compromise or crash the kernel via flowtable teardown. During network-namespace exit, nf_tables_flowtable_destroy() releases a flowtable before its registered hooks are removed, leaving netfilter hook entries with freed nft_hook and nf_flowtable references. A low-privileged local process can reach the sequence through nftables netlink messages when user and network namespaces permit CAP_NET_ADMIN, with no user interaction.

The record

CVE
CVE-2022-48935
Published
Aug 22, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 22, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.5
  2. Affected versionversion=ff4bf2f42a40e7dff28379f085b64df322c70b45 <6069da443bf65f513bb507bb21e2f87cfb1ad0b6
  3. Affected versionversion=ff4bf2f42a40e7dff28379f085b64df322c70b45 <8ffb8ac3448845f65634889b051bd65e4dee484b
  4. Affected versionversion=ff4bf2f42a40e7dff28379f085b64df322c70b45 <b4fcc081e527aa2ce12e956912fc47e251f6bd27
  5. Affected versionversion=ff4bf2f42a40e7dff28379f085b64df322c70b45 <e51f30826bc5384801df98d76109c94953d1df64

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.5; version=ff4bf2f42a40e7dff28379f085b64df322c70b45 <6069da443bf65f513bb507bb21e2f87cfb1ad0b6; version=ff4bf2f42a40e7dff28379f085b64df322c70b45 <8ffb8ac3448845f65634889b051bd65e4dee484b; version=ff4bf2f42a40e7dff28379f085b64df322c70b45 <b4fcc081e527aa2ce12e956912fc47e251f6bd27; version=ff4bf2f42a40e7dff28379f085b64df322c70b45 <e51f30826bc5384801df98d76109c94953d1df64

Published CVSS scores

5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5NISTCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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